Motor drive for lathes



April 9, 1929. E. J. HORNBE RGER MOTOR DRIVE FOR LATHES Filed Oct. 17,1924 5 Sheets-Sheet nventoz l I M APril 1929. E. J. HORNBERGER 1,708,672

MOTOR DRIVE FOR LATHES Filed Oct. 17, 1924 3 Sheets-Sheet 3 vi :4 is Z.k. a) Si d-n 1,708,672 earsurrrics.

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JGHN Gr. OLIVER.

P, 035 CLEVELAND, 933110, CGIIbISTIEG OEElEOR-GE C. BARDGIIS AND nerveson rarities.

Application filed October 1'3, 1924. Serial No. 744,195.

To convert belt driven machinery. into individual motor drivenapparatus, the practice l as been to mount a motor either on the floorbeneath a machine or upon braclr tached to the machine frame. The pincipal objection to the use of a motor which is mounted upon the flooris the difficulty of maintaining a satisfactory connection between thearn'iature shaft and the driven mber without making extensive changes inhe onst tion of the machine. The usual diiiiculty or mounting the motoron the side of the frame is the lack of space available between adjacentmachines.

To overcome the above mentioned objections. an at the same time providemeans i the belt driven machine to be L fillthe pr ncipal object of myinvenon my invention is directed toward the provision of means whichwill nit tl e driv ng connection between the 1m or and driven element tobe readily adweed to compensate for wear, and to faciliattaohm nt of onesize motor to different types of machines.

in the drawings, 1 is a perspective view showing the end of a lathehaving my invention attached thereto; 2 is a v tical section takenthrough the motor support and operating mechanism actuated by the motor;Fig. 3 is an end view showing ;-'ll of the adjusting mechanism.

i l'istrated my invention in connection with a lathe having a framewhich i it on which cone pulleys 12 are mounted in the usual manner. Todrive the shaft 11, l mount the motor above the pulley and provide apositive driving connection between the motor and pulley wheel.

The preferred form of mounting the motor comprises the use of a motorbase 1.3 which has arms 1 extending downwardly adjacent the rearwardside of the lathe head. These arms are pivotally mounted at 15 upon anaxis extending substantially parallel to the axis of the shaft 11. Amotor indicated at is carried by the base 13.

The motor base pivot 15 is mounted in the bearings which usually supportWhat is known as the back gear shaft of a lathe. in existing lathes thepractice employed is to stop the ends of the back shaft close to theouter faces of the arms 41. If, thereconverted into a motor driven masion must be added on to the shaft at each end to provide the desiredbearing area for the motor base arms. In the drawings, however, I haveillustrated a shaft which replaces the back shaft and which projectsslightly beyond each arm 41. Thus, in adapting a motor drive to oldmachines, I can work to finished surfaces without necessitating aplaning or a smoothing off of c c surfaces. Moreover, the finishedsuriaces permit themotor to be lined up quickly and ef ectively.

To effect a driving connection between the motor and shaft 11, I haveshown a pinion 21 on the armature shaft for engaging a 22 on a lay shaft23. The lay shaft in to -u may have a pinion 24 the size of whi h isdependent upon the speed reduction desired between the motor and thedriven shaft. In the preferred form, the pinion is connected by a chainbelt 25 with a gear 26 which gear is rigidly mounted upon the face ofone of the pulleys.

To support the forward end of the motor ase, l have illustrated anupright member which is adapted to be attached to the lathe frame by asecuring member 28. The "pper end of the member 27 is shown as aljustably connected to the motor base as by an adjusting screw 29 whichextends through 30 on the base and engages the top member 27. To lookthe base in adposition with reference to the mem- 27, I may employthreaded members 31 wh ch extend through slots 32 in the upi supportingmember and engage the rotor base. A

lengthwise of me hanism can be disposed above the driven element. Afurther advantage of my inventhe fact that the operating mechanism canbe ad usted with reference to the driven element for taking up slack inthe chain belt. The pivotal mounting of the motor base combined with thevertical adjustment permits the use of any one unit upon different sizesof lathes thus obviating the necessity for special equipment for eachparticular installation. By utilizing a positive driving connectionbetween the motor and driven element, then the speed of the drivenelement may be adequately controlled by employing a variable's'peedmotor.

Having thus described my invention, I

claim [In combination, alathe frame having a head spindle and back shaftbearings, of means mounted'in said bearings and projecting therebeyond,a base disposedabove tions of said means, an electric motor carried bythe base, driving connections between the motor and the head spindle,said pivotal projecting portions being longer'than the width of the armswhereby the motor base may be adjusted in a direction extending axiallyof the head spindle, and means associated with the front of the framefor enabling the motor base to be swung about said pivotal connection.

In testimony whereof, I hereunto afi'ix my signature.

EARL J. HORNBERGER. I

